Limekiln



Dec. 19,1922;

1,439,597. V. ARNOLD.

LIMEKILN.

FILED APR. 9, 1919- 3 SHEETS-SHEET 1.

INVE'N'T'UE'.

V. ARNOLD.

LIMEKILN.

FILED APR. 9, 1919.

Dec. 19, 1922 3 SHEETS-SHEET 2.

Dec. 191922, 1,439,597

- V. ARNOLD.

LIMEKILN.

FILED APR. 9. 1919. 3 SHEETS-SHEET 3.

, IN NTbH Patented Dec. 19, 1922.

. iii-r ".ar

VALENTINE ARNOLD,

OF WGODVILLE, OHIO.

LIMEK ILN.

Application filed April 9,

marked thereon, which torma part of this This invention relates to lime kilns, and has for its object'lthe provision of an improved 'kil'n of this character which has its lime burning chamber or retort of peculiar shape, whereby a; more rapidand efiicient burning or the lime isacoomplished than has heretofore been possible, and a material saving of fuel efiected. I p i A further object is, the provision, in a lime kiln, of a battery of slack arches at one side thereof or at each of opposite sides. and shaping the base portion of the lime burning chamber to suit the number of slack arches employed, thereby enhancing the practicability, eificiency, and commercial value of apparatus of this character.

Further objects and advantages of the invention will be apparent from the following detailed descriptionand drawings by persons skilled in the art. ;While the invention, in its broader aspect, is capable of embodiment in numerous forms, a preferred embodiment is illustrated in the" accompanying drawings,' in -Which Y Figure 1 is a vertical section of a kiln embodying the invention, taken'on the line taken on the line m 00 in Fig.1. Fig. 3. is across-section on the line 2 y in Fig. 1, and Fig. 4 isa -top plan View of thekiln.

Referring to the drawings, 1 designates the stack of a kiln embodying the invention, which stack, in thepresent instance, rests on a base portion 2 and co operates therewith to form a vertically-disposed retort passage in'which' the burning of the lime takes place, as is well understood in'the art.

- The walls of the passage 3'are of pecuhar contour and provide 'the passage, in succes 191a. se'r a nb, a'ta'vss.

sive' ordenfrom top to bottom thereof, with the hopper-like head portion A, the restricteftl' neck: portion B, the body portion Qiand the bztseorleg portion D. which latter, nth e present nstance, is disposed within the base portion 2 of the kiln structure.

I i'lh-e base'portion2 of the kiln' is provided with thesla'cl; arches 4t, whichin the sent instai'ice, are arranged in setsof two at each of two opposite sidesof the leg por- .tion of the retorttpassage, and each slack arch has communication at its upper rear portion w thlsaicl leg portion D through gindivi'dual passages 5. "Each arch also has animd vidual door 6 for the introducing of filer; Tlieflleg portion D of the retort passage is of elongated form in crosssection, asheremaiter more fully described, with its, .sr e' angles,to'theflame introducing passages 5,

as shownm Fig. 3, thus making it possible dimension transverse, or at right place two? ormore furnaces 4 at each side at e e n;

* Tli'e headportion"A. of the retort passage is pieierably of circular form and "is conicallyi"restrictedtothe upper edge oil the restricted "neck portion B, which is also preterablyfcircular in'cross-s'e'ction and. at

shallow depth, asshown. f

The body and leg portions, C, D ofthe retort passage reality form the retort or llmebllln'lhg chamber thereof, and-to with respect to the lime introducing neck l3. The walls of the, passage yfiares outopposite walls of" the chamber C, which walls; arefdis'posed over the furnace Pass'ages5' and may for convenience'be termed {the slde wallsof the chamber, then incline w, w in Fig. 2. Flg. 2 1s a similar section "ward and downward from the: upper flared 1 portion a, as do the sideportions b, incline outward and downward, as at c, to broaden,

AYTENT; OFFICE; I

rfiilita-te such burning, are of peculiar form the chamber C between said end walls, as

shown in Fig; 2.1"Assho wn, the walls 6 and c are flat.

It is thus evident that the downward restricting of the opposite wall portions 5, and the outward broadening of the opposed wall portions 0, will change the portions C of the retort chamber from the circular outwardly flared part a to the enlarged and transverse elongated form of the leg portion D of said chamber, as perhaps best illus trated in Fig. 4. Or, in other words, the retort chamber C, D gradually changes from restricted circular form at its top to enlarged elongated rectangular form at its bottom.

The transverse axes of the chamber C retain the same radial relation with respect to the central longitudinal axis of the cham her from the top to the bottom thereof, or, in other words, the major or minor trans verse axes of the chamber C at the various planes between the top and bottom of the chamber are superimposed upon or coincide with one another.

I The restricting of the neck portion B of the p sage 3 with respectto the upper portion of the retort chamber C, Dis important, as the flames rising through the limestone contained in said chamber are caused to seek a central passage through the lime and not to follow the walls of the chamber, as would otnerwise be the case, therebydistributing a'niore uniform burning heat throughout the lime contained in the retort. It is also evident that the restricting of the passage 3 at B forms chokes at the top of the. chamber which retards the flow of limestone into the retort chamber and effects a loosening of such stone from its closely packed state as it passes downward through said chamber, thus facilitating the passage of the burning flames therethrough. The cross sectional area of the chamber C at the bottom is considerably larger than at the top to permit loosening of thestone as it descends i in the chamber.

The chamber C may therefore, not only be termed a retort chamber, but also anexpansion chamber. 7

The lower part of the leg portion D of the retort passage is preferably restricted, and for such purpose has its end walls inwardly and downwardly inclined, as at d, Fig, 2, and its side walls outwardly and discharge hopper.

It will be'noted that the retort chamber C and fire boxes 4: are enclosed by a comparatively thick wall of masonry, the base of which rests on tiers orpillars, but the discharge hopper 7 depends below this thick wall of masonry and is constructed of comparatively thin metal to permit the contents of said hopper I to cool by radiation as it descends therein so as to prevent crystallization of the lime.

It found in practice that the shaping of the retort passage of a lime burning kiln, substantially herein described and shown in the drawings, very materially enhances the burning eiiiciency thereof and considerably increases the output of the kiln, and also that the provision of two or more slack arches at opposite sides of the retort chamber adds to the working efiiciency of the kiln.

lVhile I have herein shown and described one specific embodiment of my invention for illustrative purposes, and have disclosed and discussed in detail the construction and arrangement incident to one specific application thereof, it is to be understood that the invention is not limited to the mere detail or relative arrangement of the parts, but that deviations from the illustrated form or embodiment of the invention may be made without departing from the spirit QfllhG claims. l v

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1Q in a continuous updraft lime kiln, a retort chamber having an open feeding mouth at its top and furnace fines and a discl'iarge outlet at its lower portion, the mouth 'of said chamber being of substantially circular cross-sectional shape, the upper portion of said chamber immediately below its said mouth being flared abruptly outwardly to materially increased cross-sectional area to provide a gas choke capable of confining the burning therein, said chamber gradually widening in one directlon and gradually narrowing in the other direction and at the same time gradually increasing in crosssectional area from its said upper outwardly flared portion to its bottom portion where said fines are located, so that the lower portion of said chamber adjacent said fines is of elongated shape in cross section-and is of considerably larger cross-sectional area that it is at its said mouth. 1

2, A continuous updraft lime kiln having its shaft shaped on the inside to form a substantially inverted cone-shaped feed hopper at the top, a restricted neck below said hopper, a retort chamber below said neck, the upper portion of said chamber immediately below said neck flaring abruptly outwardly to materially increased cross-sectional area i to form a gas choke at the upper portion of said chamber to confine the burning within the latter, the walls of said chamber being flat below their flared portions and two op posed walls being inclined inwardly and downwardly and the other two opposed Walls shaft or said kiln and communicating with being inclined outwardly and downwardly to the bottom at said chamber through the gradually change the shape of said chamber longest opposed Walls thereof. 10 to substantially rectangular shape at the ln testimony whereof, I have hereunto 5 bottom, the cross-sectional area of said chamsigned my name to this specification.

her at the bottom being considerably larger than at the top, and furnaces disposed in the I VALENTINE ARNOLD. 

